Partitioning by Hash of Key
Hashing the key to spread skewed data evenly — what a partitioning hash actually needs to be, why "consistent hashing" is the wrong name for it, and the range queries you give up to get the even distribution.
#data-modeling
Partitioning by Key Range
Assigning each partition a continuous span of the key space — why the boundaries have to follow the data, what it buys on range scans, and the hot spot a timestamp key walks straight into.